User's Manual

DR-915 OEM DATA RADIO MODULE

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Revision I INTEGRATOR’S GUIDE

interface. Applications requiring RS-232 must use an appropriate interface circuit

or a DR-915 RS-232 interface board.

PIN 5 – Transmit Data

This is the data sent by the user device for the radio to transmit. The data

format is a standard asynchronous stream at the user-set baud rate with one

start bit (low) followed by 8 data bits and at least one stop bit (high). This is a

TTL-level interface. Applications requiring RS-232 must use an appropriate

interface circuit or a DR-915 RS-232 interface board.

PIN 6 – Reset

Taking this pin low will reset the radio’s micro controller. For normal operation,

this pin should be left open.

PIN 7 – SPI Clock

This is the SPI clock signal. Data is clocked into and out of the DR-915 on the

rising edge. This pin is also used for updating the code in the radio.

PIN 8 – SPI MISO

This is the SPI data from the radio to the host when in SPI mode. This pin also

indicates a failure to complete an transmission while in Ack-Back™ mode. This

pin is also used for updating the code in the radio.

PIN 9 – SPI MOSI

This is the SPI data to the radio from the host when in SPI mode. This pin also

indicates the radio is attempting a transmission while in Ack-Back™ mode. This

pin is also used for updating the code in the radio.

PIN 10 – VCC

This is power to the radio. It should be 7.5 to 15 vdc.